EPPlus/Style/XmlAccess/ExcelColorXml.cs

/*******************************************************************************
 * You may amend and distribute as you like, but don't remove this header!
 *
 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
 * See http://www.codeplex.com/EPPlus for details.
 *
 * Copyright (C) 2011  Jan Källman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
 * See the GNU Lesser General Public License for more details.
 *
 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
 *
 * All code and executables are provided "as is" with no warranty either express or implied. 
 * The author accepts no liability for any damage or loss of business that this product may cause.
 *
 * Code change notes:
 * 
 * Author							Change						Date
 * ******************************************************************************
 * Jan Källman		                Initial Release		        2009-10-01
 * Jan Källman		License changed GPL-->LGPL 2011-12-16
 *******************************************************************************/
using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Globalization;
namespace OfficeOpenXml.Style.XmlAccess
{
    /// <summary>
    /// Xml access class for color
    /// </summary>
    public sealed class ExcelColorXml : StyleXmlHelper
    {
        internal ExcelColorXml(XmlNamespaceManager nameSpaceManager)
            : base(nameSpaceManager)
        {
            _auto = false;
            _theme = "";
            _tint = 0;
            _rgb = "";
            _indexed = int.MinValue;
        }
        internal ExcelColorXml(XmlNamespaceManager nsm, XmlNode topNode) :
            base(nsm, topNode)
        {
            if(topNode==null)
            {
                _exists=false;
            }
            else
            {
                _exists = true;
                _auto = GetXmlNodeBool("@auto");
                _theme = GetXmlNodeString("@theme");
                _tint = GetXmlNodeDecimalNull("@tint")??decimal.MinValue;
                _rgb = GetXmlNodeString("@rgb");
                _indexed = GetXmlNodeIntNull("@indexed") ?? int.MinValue;
            }
        }
        
        internal override string Id
        {
            get
            {
                return _auto.ToString() + "|" + _theme + "|" + _tint + "|" + _rgb + "|" + _indexed;
            }
        }
        bool _auto;
        public bool Auto
        {
            get
            {
                return _auto;
            }
            set
            {
                _auto = value;
                _exists = true;
                Clear();
            }
        }
        string _theme;
        /// <summary>
        /// Theme color value
        /// </summary>
        public string Theme
        {
            get
            {
                return _theme;
            }
        }
        decimal _tint;
        /// <summary>
        /// Tint
        /// </summary>
        public decimal Tint
        {
            get
            {
                if (_tint == decimal.MinValue)
                {
                    return 0;
                }
                else
                {
                    return _tint;
                }
            }
            set
            {
                _tint = value;
                _exists = true;
            }
        }
        string _rgb;
        /// <summary>
        /// RGB value
        /// </summary>
        public string Rgb
        {
            get
            {
                return _rgb;
            }
            set
            {
                _rgb = value;
                _exists=true;
                _indexed = int.MinValue;
                _auto = false;
            }
        }
        int _indexed;
        /// <summary>
        /// Indexed color value
        /// </summary>
        public int Indexed
        {
            get
            {
                return (_indexed == int.MinValue ? 0 : _indexed);
            }
            set
            {
                if (value < 0 || value > 65)
                {
                    throw (new ArgumentOutOfRangeException("Index out of range"));
                }
                Clear();
                _indexed = value;
                _exists = true;
            }
        }
        internal void Clear()
        {
            _theme = "";
            _tint = decimal.MinValue;
            _indexed = int.MinValue;
            _rgb = "";
            _auto = false;
        }
        public void SetColor(System.Drawing.Color color)
        {
            Clear();
            _rgb = color.ToArgb().ToString("X");
        }

        internal ExcelColorXml Copy()
        {
            return new ExcelColorXml(NameSpaceManager) {_indexed=_indexed, _tint=_tint, _rgb=_rgb, _theme=_theme, _auto=_auto, _exists=_exists };
        }

        internal override XmlNode CreateXmlNode(XmlNode topNode)
        {
            TopNode = topNode;
            if(_rgb!="")
            {
                SetXmlNodeString("@rgb", _rgb);
            }
            else if (_indexed >= 0)
            {
                SetXmlNodeString("@indexed", _indexed.ToString());
            }
            else if (_auto)
            {
                SetXmlNodeBool("@auto", _auto);
            }
            else
            {
                SetXmlNodeString("@theme", _theme.ToString());
            }
            if (_tint != decimal.MinValue)
            {
                SetXmlNodeString("@tint", _tint.ToString(CultureInfo.InvariantCulture));
            }
            return TopNode;
        }

        bool _exists;
        internal bool Exists
        {
            get
            {
                return _exists;
            }
        }
    }
}